eli5 What do we know about what’s outside the observable universe?
In: 0
We can’t observe anything first hand. But we know there is mass out there because it has an effect on things we can see at the edge of the observable universe. We also know that space is expanding outside the observable universe again for similar reasons.
It’s also theoretical possible due to the expansion of space that some objects which are now outside the observable universe left traces of their existence at the edge of the boundary before they moved outside. And those things might be possible to observe.
On a similar note, the things at the very edge of the observable universe now will at some point be outside the observable universe. And therefore anything we learn about them now would be considered known things from outside the observable universe.
Latest Answers